Fabrication and Imaging of Monolayer Phosphorene with Preferred Edge Configurations via Graphene-Assisted Layer-by-Layer Thinning

Yangjin Lee, Sol Lee, Jun Yeong Yoon, Jinwoo Cheon, Hu Young Jeong, Kwanpyo Kim

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Phosphorene, a monolayer of black phosphorus (BP), is an elemental two-dimensional material with interesting physical properties, such as high charge carrier mobility and exotic anisotropic in-plane properties. To fundamentally understand these various physical properties, it is critically important to conduct an atomic-scale structural investigation of phosphorene, particularly regarding various defects and preferred edge configurations. However, it has been challenging to investigate mono- and few-layer phosphorene because of technical difficulties arising in the preparation of a high-quality sample and damages induced during the characterization process. Here, we successfully fabricate high-quality monolayer phosphorene using a controlled thinning process with transmission electron microscopy and subsequently perform atomic-resolution imaging. Graphene protection suppresses the e-beam-induced damage to multilayer BP and one-side graphene protection facilitates the layer-by-layer thinning of the samples, rendering high-quality monolayer and bilayer regions. We also observe the formation of atomic-scale crystalline edges predominantly aligned along the zigzag and (101) terminations, which is originated from edge kinetics under e-beam-induced sputtering process. Our study demonstrates a new method to image and precisely manipulate the thickness and edge configurations of air-sensitive two-dimensional materials.

Original languageEnglish
Pages (from-to)559-566
Number of pages8
JournalNano letters
Volume20
Issue number1
DOIs
Publication statusPublished - 2020 Jan 8

Bibliographical note

Funding Information:
This work was mainly supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF-2017R1A5A1014862, NRF-2018R1A2B6008104, and NRF-2019R1C1C1003643), the Institute for Basic Science (IBS-R026-D1), and Yonsei University Future-leading Research Initiative of 2019 (2019-22-0027). K.K. also acknowledges support from the POSCO Science Fellowship of POSCO TJ Park Foundation.

Funding Information:
This work was mainly supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF-2017R1A5A1014862, NRF-2018R1A2B6008104, and NRF-2019R1C1C1003643) the Institute for Basic Science (IBS-R026-D1), and Yonsei University Future-leading Research Initiative of 2019 (2019-22-0027). K.K. also acknowledges support from the POSCO Science Fellowship of POSCO TJ Park Foundation.

Publisher Copyright:
Copyright © 2019 American Chemical Society.

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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